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Note 13. Commitments And Contingencies Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 $ 165    
2020 144    
2021 120    
2022 95    
2023 79    
Thereafter 196    
Total future minimum operating lease payments due 799    
Capital lease obligations 33 $ 29  
Imputed interest 2 2  
Rent expense $ 196 $ 192 $ 186